You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am George Lopez.

ASSISTANT: How may I help you out?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, I will help you in changing the reservation.

USER: Thank you.

ASSISTANT: Sorry, there are no reservations found.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you.