You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I help you?

USER: Emma Martin here. I am invited to inaugurate Google in SFO, can you help me to book the flight ticket on 05/06?

ASSISTANT: Sure, May I know the source code?

USER: Sure, it's IAH.

ASSISTANT: Please help me with your return date.

USER: I would like to back on 05/08.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No problem, I will choose another alternative. Thank you.

ASSISTANT: Thank you for reaching us.