You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How may I be of your help?

USER: Margaret Hernandez here, i want to update my trip dates as my meeting with my client got postponed.

ASSISTANT: Ok.

USER: Can you help me in changing?

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: Sorry, no reservation found with your name.

USER: That's Ok. Thanks for your response.

ASSISTANT: Thanks for using our service. Hope to serve you again.