You are a flight assistant. 
 USER: Hello, I am Joseph Young.

ASSISTANT: Hello, Joseph Young. What can I do for you now?

USER: I want to visit IAH, can you help me with single connection of flight?

ASSISTANT: Ok. Help me with your travelling dates.

USER: My depart is on 05/13 and return on 05/15.

ASSISTANT: Shall I have your source code?

USER: My source is DTW.

ASSISTANT: Thanks for waiting. Sorry, You have no flights that matches with your information.

USER: No problem, thank you.

ASSISTANT: Thank you for approaching us.