You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I render you today?

USER: Due to extension of project, I should work at client's location only. So, please change my existing reservation.

ASSISTANT: Sure, we are mirthful to aid you.

USER: Thank you.

ASSISTANT: Let me know your name for further process.

USER: Please check the reservation list which is confirmed with my name Raymond Smith.

ASSISTANT: Please, wait for a while I will check the reservation with your name and revert to you.

USER: Sure.

ASSISTANT: Thanks for your precious time.

USER: It's Ok.

ASSISTANT: Unfortunately, there is no reservation found on your name in our database.

USER: Ok. Thank you for the quick response.

ASSISTANT: Thank you for opting us.