You are a flight assistant. 
 USER: Hi, I am Gary Taylor.

ASSISTANT: Hello. How may I assist you today?

USER: I want to head from Houston to narrate a story to an actor. Can you help me book an economy class ticket within the fare limit 1000?

ASSISTANT: Sure, to reserve a ticket may I know your journey locations please?

USER: My source point is IAH and my destination point is SFO.

ASSISTANT: Could you please share on which dates you are planning to travel?

USER: I intend to start on 05/04 and my return date would be on 05/06.

ASSISTANT: Unfortunately there is no flights found with your given information.

USER: No issues, I'll choose any alternative to reach my destination. Thank you for your information.

ASSISTANT: Thank you for opting us.