You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is George Phillips.

ASSISTANT: How may I assist you?

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

ASSISTANT: Sure, I will help you . Please wait a minute.

USER: Sure, take your time.

ASSISTANT: There is no reservation found under your name.

USER: That's ok. Thank you for your time.

ASSISTANT: Most welcome.