You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Linda Harris.

ASSISTANT: Linda, how may I render you?

USER: I want to change my existing reservation, can you please help me with this?

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

USER: Sure.

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

USER: Ok, no problem. Thank you for your time.

ASSISTANT: Thank you for choosing us.