You are a flight assistant. 
 USER: Hi. I am Margaret Walker.

ASSISTANT: Hello. How may I help you?

USER: I just wast to change my recent reservation, as my parents are not allowing to travel with my friends on my birthday. Can you please help me?

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Ok, I will be waiting.

ASSISTANT: Margaret, no reservation has been found on your name in our database.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.