You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Brenda Allen here.

ASSISTANT: How may I assist you?

USER: I would like to travel from DFW to OAK, can you please help me out with booking of a flight ticket?

ASSISTANT: Sure Allen, can you provide me your trip dates?

USER: Sure, I am planning to move on 08/24 and please book my return ticket on 08/26.

ASSISTANT: Sorry Allen, there is no flights in your route.

USER: Oh! So sad to hear. Thank you for the information.

ASSISTANT: Thank you for reaching us.