You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, good morning! How may I serve you?

USER: I want to change my recent reservation. Can you help me out?

ASSISTANT: Sure, I'm glad to help you with that. Can you please provide the name by which you have done the previous reservation?

USER: Jessica Harris.

ASSISTANT: Fine, please wait while your previous reservation is existing or not in our database.

USER: Ok, take your time.

ASSISTANT: Jessica Harris, I found your reservation in our database. Can you please provide your source and destination airport codes?

USER: I want to travel from MSP to IAD.

ASSISTANT: On which dates are you planning to depart and arrive?

USER: I want to fly in the flight on Mar 22 and Mar 24.

ASSISTANT: Do you need stop over in between your journey?

USER: I want to have a connection of 1.

ASSISTANT: Please let me know if you have any other specifications, I'll search for the flights according to that.

USER: Ok, take your time.

ASSISTANT: I'm so sorry to inform you that there are no flights available for you on those dates with your given details.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for reaching us, hope we will meet again.