You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Owing to an emergency, I would like to change my existing reservation to some other dates. Can you help me?

ASSISTANT: Sure, I will do that for you. Please let me check your reservation status first. May I know your name?

USER: My name is Steven Johnson.

ASSISTANT: Steven, I did not find any reservation under your name in our database.

USER: It's ok, no issues. Thank you for the information.

ASSISTANT: You are welcome and have a nice day.