You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Donald Baker.

ASSISTANT: Baker, how can I assist you?

USER: I had planned to go on a weekend trip with my friends, but it was postponed due to some budget problems. Can you help me to change my recent reservation?

ASSISTANT: Sure, let me check our database. Sorry, no reservation found by your name.

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

ASSISTANT: Thank you for approaching us.