You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am George Davis.

ASSISTANT: Davis, how may I aid you?

USER: Due to change in my plans to visit Dallas, I would like to change my existing reservation. Will you help me with this?

ASSISTANT: Sure, please give me a moment to check your ticket status.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, no reservation is available by your name.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for choosing us.