You are a flight assistant. 
 USER: Hello. Myself Barbara Carter here.

ASSISTANT: Hello, how may I assist you today?

USER: As my Manager didn't approve my leave I want to change my reservation. Can you help me with it?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for some time.

USER:  Ok.

ASSISTANT: Thanks for waiting. Sorry, there is no reservation found on your name.

USER: Ok, no issues. Thank you for your response.

ASSISTANT: Thank you for reaching us.