You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Anthony carter. Unfortunately my father has booked a ticket on wrong dates, can you help me changing reservation?

ASSISTANT: Yes, I am here for helping to you Carter. Please wait a while to check it.

USER: Sure.

ASSISTANT: Thank you for waiting, as per your request there is no reservation to change it. Thank you for your valuable time in reaching us with your query.

USER: That's fine, thank you for your help.

ASSISTANT: Welcome.