You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in changing my reservation?

ASSISTANT: Sure, we are here to help you. May I know your name please?

USER: I am Frank Martinez.

ASSISTANT: I found your reservation on your name, let me know your travel dates please?

USER: My travel dates are from Oct 05 to Oct 07.

ASSISTANT: Please mention your travelling airport codes.

USER: I would like to board from PHL to reach LGA.

ASSISTANT: Do you have any specifications?

USER: I would like to travel in connecting flight which departs in the evening.

ASSISTANT: Sorry, no flights are found on your desired route.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.