You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to change my existing  reservation, because I want to travel  with my friends by road. Can you help me in changing the ticket?

ASSISTANT: Sure, I am glad to help you in modifying your reservation.

USER: Thank you.

ASSISTANT: Can you please provide your name as I need to check your previous reservation status?

USER: Yes, I am Ashley Young.

ASSISTANT: Ok, thank you. Sorry Young for the inconvenience caused, there is no reservation found under your name in our records to amend it.

USER: Ok, not a problem.

ASSISTANT: Thank you for choosing our agency.

USER: Thank you for your valuable information.