You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: John Hernandez here.

ASSISTANT: How can I help you?

USER: I need your help in booking of a flight ticket between HOU and DTW, can you please help me out with booking of a flight ticket?

ASSISTANT: On which date you like to travel?

USER: I am planning to leave on 01/06 and please book my return ticket on 01/08.

ASSISTANT: I am sorry no flights available on your route.

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

ASSISTANT: Thank you for your help.