You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I assist you?

USER: Frank Thomas is my name and I want to change the reservation due to having some health problems. Will you aid me in this ?

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: I regret, no reservation found by name Frank Thomas.

USER: Fine.

ASSISTANT: Thanks.

USER: Thank you for being helpful.