You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Shirley Harris, want to alter my recent reservation due to some emergency. Please help me out with that.

ASSISTANT: Sure, please give me a moment to check our database.

USER: Sure, take your time.

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

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

ASSISTANT: Thank you for choosing us.