You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Dorothy Collins here.

ASSISTANT: Ok.

USER: I would like to change my reservation as I am leaving for pilgrimage. Can you please help me out?

ASSISTANT: Sure, I will help you with that. Please give me a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Your reservation is found. Please mention your travelling dates.

USER: My travel dates are June 18 and June 20.

ASSISTANT: Please provide your airport codes.

USER: My preferable airport codes are MSP to LGA.

ASSISTANT: Do you have any specifications?

USER: My depart time is Evening and my return time is Afternoon.

ASSISTANT: Do you have any other specifications?

USER: Yes, I need a connecting flight in my journey.

ASSISTANT: Please give me a moment.

USER: Sure, take your own time.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

USER: Not an issue, anyway thank you for the information.

ASSISTANT: Welcome, have a great day.