You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I would like to change my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, may I know the name to check for the status?

USER: Thank you for considering my request. Please check the reservation under the name of Melissa Hill.

ASSISTANT: Please be on hold, I will get back to you in a minute.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting. Here, there is no active reservation has been found under your name in our database to amend it.

USER: Not an issue with this one, anyway thank you for the information.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your service.