You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Can you please help me in changing my existing reservation to Boston? As my meeting got postponed.

ASSISTANT: Sure, may I know your name?

USER: My name is Gary Jones.

ASSISTANT: We found your active reservation, can you help me with your new airport codes?

USER: My airport codes of journey are from LAS to BOS.

ASSISTANT: May I know your planned dates to travel?

USER: My planned dates of journey are July 29 and July 31.

ASSISTANT: Is there any connection limit?

USER: I prefer connecting flight.

ASSISTANT: May I know any other specifications that you require?

USER: I prefer normal cost airlines for this trip.

ASSISTANT: Ok, please be on hold until I revert you.

USER: Sure, I will wait for your information.

ASSISTANT: Sorry, there are no flights found with your required dates to travel.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for reaching us.