You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Kathleen Garcia here.

ASSISTANT: How may I help you?

USER: Due to some health issues, I want to postpone my trip to some other dates. Can you please help me in changing my recent reservation?

ASSISTANT: Sure, I will help you. Garcia, no reservation has been found on your name in our database.

USER: Oh! May be I did a wrong booking. Thank you anyways.

ASSISTANT: Thank you for approaching us.