You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi.

USER: My name is Larry Hernandez.

ASSISTANT: How may I help you?

USER: Due to an emergency, my family trip is postponed. Could you help me in changing the reservation?

ASSISTANT: Sure. Larry Hernandez, I am sorry your reservation is not found. Thank you.

USER: That's ok. Thank you for your time.

ASSISTANT: Your welcome.