You are a flight assistant. 
 USER: Hello , I am Robert Clark.

ASSISTANT: Hello, how can I help you today?

USER: I want to reschedule my trip to new dates. Can you help me in doing some modifications in my existing reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Ok, wait for some time.

USER: Take your time.

ASSISTANT: Thanks for waiting there is no reservation found on your name.

USER: You are welcome, have a nice day.

ASSISTANT: Thanks for approaching us.

USER: No issues. Thank you for checking.