You are a flight assistant. 
 USER: Hi, I am Joshua Martinez.

ASSISTANT: Hello, how can I aid you today?

USER: As I am scientist I need to visit botanical garden in Boston, BOS. Will you help me in booking me a flight with the fare of 200?

ASSISTANT: Sure, I am here to help you, may I know your travelling dates?

USER: Thank you. 02/04- 02/06 are my willing dates for travel.

ASSISTANT: Could you please help me with your lay by's?

USER: Yes, I need a lay by in between my travel.

ASSISTANT: Please mention your source code.

USER: My source airport is San Francisco, SFO.

ASSISTANT: Sorry Joshua Martinez, no flights found on your requested dates.

USER: Ok, I will choose other airline.

ASSISTANT: Thank you for approaching us.

USER: Thank you for quick response.