You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am George Williams.

ASSISTANT: How may I guide you today?

USER: I want to change my recent reservation. Can you help me out?

ASSISTANT: Sure, I will help you with that. Please give me a minute.

USER: Ok, take your own time.

ASSISTANT: I am sorry to say that there is no reservation.

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

ASSISTANT: Thank you for contacting us.