You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Samantha Moore.

ASSISTANT: How may I aid you?

USER: I need to book a ticket to meet my girlfriend for talking about the marriage. Could you please help me in booking a ticket on 01/10?

ASSISTANT: Sure, when would you like to return?

USER: I would like to return on 01/12.

ASSISTANT: How much can you afford for a ticket fare?

USER: I can pay up to 500.

ASSISTANT: Help me with the source and destination airport codes?

USER: Sure, my source and destination codes are EWR and DEN.

ASSISTANT: Thank you for your details, we do not found any flights running in your given dates. Thank you for reaching us. Have a nice day.

USER: Fine, thank you for your information.