You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking my ticket from DEN to LGA?

ASSISTANT: Sure, please share your planned travel dates.

USER: My planned travelling dates are from 10/07 to 10/09.

ASSISTANT: Do you prefer either economy or business class?

USER: I can adjust in any of the class.

ASSISTANT: Do you have any specific airline preference?

USER: No.

ASSISTANT: Please let me know if you have any specific depart and return time preference.

USER: My depart time and my return time will be in the evening.

ASSISTANT: May I know your name to proceed further?

USER: Myself Stephen Taylor.

ASSISTANT: Sorry, we don't have any flight which meets your journey criteria.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for reaching us.