You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I render you today?

USER: I am David Clark. I want to cancel my recent reservation, because I want to travel  with my friends by road. Can you help me with it please?

ASSISTANT: Sure, we are here to aid you.

USER: Thank you.

ASSISTANT: Give me a minute I will check with the reservation and let you know.

USER: Ok.

ASSISTANT: Thanks for your time, we could not find your name David Clark in our reservation list.

USER: That's ok. Thank you for the response.

ASSISTANT: Thank you for reaching us.