You are a flight assistant. 
 USER: Hi. I am Helen White here.

ASSISTANT: Hello. How may I assist you?

USER: I want to reserve my ticket from HOU to OAK, can you please help me in this?

ASSISTANT: Sure, may I know your travel dates?

USER: Sure, my planned dates of journey are from Jul, 04 to Jul, 06.

ASSISTANT: At what time do you like to travel?

USER: Yes, I need a return time at evening.

ASSISTANT: Sorry, there is no flight on your details. Thank you.

USER: Ok, thank you.