You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: As my manager did not approve my leave, I would like to change my recent reservation. Can you help me with that?

ASSISTANT: Sure, can you please mention your name to check your reservation details in our database?

USER: Brenda Garcia here.

ASSISTANT: Thank you, please wait for a while.

USER: Sure.

ASSISTANT: I am sorry to say you that there is no reservation found under your name in our database.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.