You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Steven Garcia. I want to change my reservation on my booking dates, can you help me in changing the reservation?

ASSISTANT: Yes sure. Please wait for a moment to check your details.

USER: Sure, take your own time.

ASSISTANT: Sorry, there is no reservation is found on your name in my records. Do you want to know anything else?

USER: No I am ok with that. Thank you for helping me.

ASSISTANT: Ok, you are welcome.