You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Joseph Thomas here. Can you help me in changing my reservation?

ASSISTANT: Sure, I will help you in changing the reservation. Please give me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry Thomas, there are no reservations found on this name.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for choosing our services.