You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,.

USER: I am Betty Evans.

ASSISTANT: How can I render you today?

USER: I want to book a flight ticket to San Francisco, SFO. Please help me in booking from Dallas, DFW.

ASSISTANT: Sure, we are mirthful to aid you. When did you plan to start your trip?

USER: I want to start my journey on 05/20.

ASSISTANT: Please, mention your price limit.

USER: I can pay up to 500.

ASSISTANT: Ok. When you will catch the return flight?

USER: I will be return on 05/22.

ASSISTANT: Thanks for your details, please wait for a while I will check the availability of flights and revert to you.

USER: Ok, I will wait for your response.

ASSISTANT: Thanks for waiting.

USER: Ok.

ASSISTANT: There is a flight found in  1027 AA airline with the fare of 100.

USER: Yes, I think that can work for me.

ASSISTANT: Sure, your E - ticket has been generated with a halt and it will be sent to your registered Email -id shortly.

USER: Thank you for your assistance.

ASSISTANT: Thank you for choosing us, have a colorful day!.