You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best assist you now?

USER: I want to change my existing reservation, as I have changed my schedule due to some problems. Can you please help me out with it?

ASSISTANT: Sure, may I know your good name please?

USER: My name is Rebecca Scott.

ASSISTANT: Please wait.

USER: Ok, sure.

ASSISTANT: There is a reservation found on your name, to proceed further I need to know journey dates?

USER: Thank you. My journey dates are July 24th and July 26th.

ASSISTANT: Can you please share me your airport codes?

USER: BOS and DEN are my airport codes.

ASSISTANT: Do you need any lay by between journey?

USER: I prefer to travel in a single connecting flight.

ASSISTANT: Thanks for your details, we are sorry to say that there is no flights found on your requested dates.

USER: Ok, not a problem. Thanks for the information.

ASSISTANT: Thanks for reaching us.