You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please book me a flight ticket on the name Sandra Martin on 07/07 to attend my uncle's house warming ceremony?

ASSISTANT: Sure, when are you planning to travel?

USER: I will go on 07/07 and intend to back on 07/09.

ASSISTANT: Please provide your airport codes.

USER: My source point is DEN and destination is SFO.

ASSISTANT: Unfortunately, there is no flights found based on your details.

USER: No issue, thank you for your time.

ASSISTANT: Thank you for choosing us.