You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am trying to change the ticket details in the past ticket, can you please help me to do that?

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: Thank you for considering my request. My name is Raymond Garcia.

ASSISTANT: Please allow me a moment.

USER: Sure, I will wait for your response. Take your time.

ASSISTANT: There is no reservation found under your name in our data base.

USER: Oh! It is sad to hear. Anyhow thank you for your time.

ASSISTANT: Thank you for contacting us.